Heating-furnace



2 sheets-shea 2. P. W. ELLIOTT.

HEATING FURNAGE. No. 552,055. Patented Dec. 24, 1895.

ANDREW l GRAHAM PHOTO Lm'OWASHINGTDlDC UNITED STATES PATENT OEEIcE.

PEROIVAL NV. ELLIOTT, 'OF READING, ASSIGNOR TO THE HIGHLAND FOUNDRY COMPANY, OE BOSTON, MASSACHUSETTS.A

HEATING-FURNACE.

SPECIFICATION forming part of vLetters Patent No. 552,055, dated December 24, 1895.

Application filed .Iuly 30, 1894. Serial No. 518,907. (No model.)

T0 all whom, it may concern:

Be it known that I, PERcIvAL W. ELLIOTT, a citizen of the United States, residing at Reading, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Heating-Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming apart of this specification, in explaining its nature.

The invention relates to the herein-described improvement in heating-furnaces, whereby a volume of air preferably taken from the cold-air inlet is independently highly heated in a chamber in the upper part of the combustion-chamber, and then mingled with the heated air in the upper part of the usual heating-chamber, from whence it is distributed by means of the usual distributing-pipes, the object of the invention being` to increase the heating capacity of the furnace and also to increase its circulating power, and to prevent the formation in any part of the usual heating-chamber of dead-air spaces, the introduction of the more highly heated air into the upper part of the heatingchamber employing or causing amore rapid circulation of the heat in it and from it than would otherwise occur.

In the drawings, Figure 1 is a view principally in vertical central section upon the dotted line a: c of Eig. 2 of a heating-furnace having the features of `my invention. Fig. 2 is a view principally in horizontal section upon the dotted line y fj of Fig. l.

A is the ash-pit of the furnace; B, the firepot; C, the combustion-chamber; D, the outer casing or shell, and E the usual air-heating chamber. In the upper part of the combustion-chamber C is the customary air-heating chamber E. This is preferablyformed by the circular casting f, the cavity of which forms the heating-chamber, and which casting has radiating from it and integral therewith the tubular sections f each tubular section having an enlargement f2 and iiange f3, which bears against the inner surface of the combustion-chamber wall and is secured thereto by bolts or rivets which pass through holes therein, and the flange f4 of the exterior lianged collar f5, the sleeve of the collar entering a hole in the wall of the combustion-chamber, and the enlargement of the tube f. (See Fig. l.) One of these radiating tubes forms the inlet-passage G and the others the outlet-passages H. The inlet-passage G has a collar f5, which is also provided with an outward pipe-holding section to receive the upper end of a pipe f7, which extends from the cold-air inlet f8 and provides means whereby the cold air is drawn or taken from the inlet. The outlets H open into the heating-chamber E.

The operation of the device is as follows: The cold or outer airis supplied the main heating-chamber E and the heating-chamber E by means of the inlet or cold-air,supply f8, the air for the supply of the heating-chamber E passing through the pipe f7 to it from the source of supply, the said pipe preferably being within the outer casing D of the furnace or in the hot-air chamber, but not necessarily so. The air thus introduced into the chamber E circulates through it,is very highly heated therein and is expelled with considerable force into the upper part of the air-heating chamber through the outlets H, and thereby prevents the air in the upper part of the chamber from becoming dead and causes suflicient increase in the air-pressure to produce a better circulation from the heating chamber through the usual conducting-pipes, and also adds to the heating capacity of the furnace.

While I prefer the -form of auxiliary heating-chamber shown, because of its cheapness of construction and application and its great heating power, yet I do not conne myself to the especial type described, so far as the principal features of my invention are concerned.

VHaving thus fully described my invention, I claim and desire to secure by Letters Patent of the United States- The combination in aheating furnace of the combustion chamber O circular in shape, the heating chamber E surrounding the combustion chamber and the auxiliary heating chamber F, formed of a circular casting, placed in the top of the combustion chamber near its wall, having a direct connection with the outer air and connected with the main heating chamber E by the outlets H, as and for the purposes` described.

' PERCIVAL W. ELLIOTT.

Witnesses:

F. F. RAYMOND, 2d, J. M. DOLAN. 

